Music naturally has quiet bits and loud bits. If you strum a guitar chord, it starts off loud and then gets quieter as the notes die away.
Now imagine if you had your hand on the volume control, and you turned up the volume as soon as the chord started to fade out. It would make the chord sound louder for longer, which would make the whole thing sound a lot louder.
Music producers have access to computer software (and hardware devices too) that will perform this process automatically. They can tune this software to either have a big impact, or a subtle impact, and this will affect whether the end result sounds louder or not.
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